Bug 360441 – kernel dm: some dm ioctl can fail with 32bit userspace and 64bit kernel

Bug 360441 - kernel dm: some dm ioctl can fail with 32bit userspace and 64bit kernel

Summary:	kernel dm: some dm ioctl can fail with 32bit userspace and 64bit kernel

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	5.0
Hardware:	x86_64 Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Milan Broz
QA Contact:	Martin Jenner
Docs Contact:

URL:
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Reported:	2007-10-31 11:29 EDT by Milan Broz
Modified:	2013-02-28 23:05 EST (History)
CC List:	3 users (show)

See Also:
Fixed In Version:	RHBA-2008-0314
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2008-05-21 10:59:58 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Milan Broz 2007-10-31 11:29:05 EDT

Description of problem:

DM-ioctl structure on 32bit on i386 arch has size 308 bytes,
on x86_64 312 bytes.

Some dm ioctl can then fail because of align check in kernel:

/dmsetup.static.32.rhel -vv message mpath 0 fail_if_no_path
dm version   OF   [16384]
dm message mpath  OF  fail_if_no_path [16384]
device-mapper: message ioctl failed: Invalid argument
Command failed

Because dm processing uses own code to checks validity of ioctl struct,
fix can be backported without changing kABI.

Comment 1 RHEL Product and Program Management 2007-10-31 11:35:31 EDT

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 4 Don Zickus 2008-01-08 15:46:41 EST

in 2.6.18-64.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 7 errata-xmlrpc 2008-05-21 10:59:58 EDT

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2008-0314.html

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